309 



The animal inhabiting this shell is said to ex- 

 pand two arms, connected by a membrane in the form 

 of a sail, and two others acting as oars; by the aid of 

 which it is propelled and guided on the surface of the 

 sea, in its elegant, but frail bark. On receiving any 

 alarm, or the weather becoming too rough for its con- 

 venient navigation, the animal withdraws its sail and 

 oars, and, retreating into the interior of the shell, sinks 

 to the bottom. 



Argonauta argo Argonauta tuberculosa 



Argonauta nitida. 



OCTOPUS. 

 sepia octopus. — Linn. 

 A molluscous animal, enclosing a very small dorsal 

 osseous substance. 



Octopus vulgaris Octopus cirrhosus 



granulatus moschatus. 



LOLIGOPSIS. 



A molluscous animal, but without any interior bone. 

 Loligopsis Peronii. 



